﻿# from tkinter import *
# import tkinter.messagebox as messagebox
# class Application(Frame):
# 	def __init__(self,master=None):
# 		Frame.__init__(self,master)
# 		self.pack()
# 		self.createWidgets()

# 	def createWidgets(self):
# 		self.nameInput=Entry(self)
# 		self.nameInput.pack()
# 		self.helloLabel=Label(self,text='输入你的名字!')
# 		self.helloLabel.pack()
# 		self.alertButton=Button(self,text='Hello',command=self.hello)
# 		self.alertButton.pack()
# 		self.quitButton=Button(self,text='Quit',command=self.quit)
# 		self.quitButton.pack()
# 	def hello(self):
# 		name=self.nameInput.get() or 'zyq'
# 		messagebox.showinfo('Messsage','Hello,%s'%name)

# app=Application()
# app.master.title('你好')
# app.mainloop()

#绘画矩形
# from turtle import *

# # 设置笔刷宽度:
# width(4)

# # 前进:
# forward(200)
# # 右转90度:
# right(90)

# # 笔刷颜色:
# pencolor('red')
# forward(100)
# right(90)

# pencolor('green')
# forward(200)
# right(90)

# pencolor('blue')
# forward(100)
# right(90)

# # 调用done()使得窗口等待被关闭，否则将立刻关闭窗口:
# done()

#绘画五角星
# from turtle import *

# def drawStar(x, y):
#     pu()
#     goto(x, y)
#     pd()
#     # set heading: 0
#     seth(0)
#     for i in range(5):
#         fd(40)
#         rt(144)

# for x in range(0, 250, 50):
#     drawStar(x, 0)

# done()

from turtle import *

# 设置色彩模式是RGB:
colormode(255)

lt(90)

lv = 14
l = 120
s = 45

width(lv)

# 初始化RGB颜色:
r = 0
g = 0
b = 0
pencolor(r, g, b)

penup()
bk(l)
pendown()
fd(l)

def draw_tree(l, level):
    global r, g, b
    # save the current pen width
    w = width()

    # narrow the pen width
    width(w * 3.0 / 4.0)
    # set color:
    r = r + 1
    g = g + 2
    b = b + 3
    pencolor(r % 200, g % 200, b % 200)

    l = 3.0 / 4.0 * l

    lt(s)
    fd(l)

    if level < lv:
        draw_tree(l, level + 1)
    bk(l)
    rt(2 * s)
    fd(l)

    if level < lv:
        draw_tree(l, level + 1)
    bk(l)
    lt(s)

    # restore the previous pen width
    width(w)

speed("fastest")

draw_tree(l, 4)

done()